Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1997-07-29
1999-11-02
Evans, Jefferson
Dynamic magnetic information storage or retrieval
Record medium
Disk
427554, G11B 582, B05D 300
Patent
active
059781890
ABSTRACT:
A substrate for a magnetic recording medium. The substrate is a non-magnetic brittle material having a substantially flat surface on which laser marks having a height in a range of 10-500 .ANG. are formed in a landing zone. The laser marks are formed by irradiating a pulsed laser beam having a wavelength capable of being absorbed in the non-magnetic brittle material within a range of substantially circular form having a waist diameter D .mu.m, and which has a physical property of 0.5<E.sup.v /(D/20).sup.2 <6 .mu.J where E.sup.v .mu.J represents a pulse energy for initiating vaporization of the glass substrate by irradiation of the pulsed laser.
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P. Baumgart, et al., "A New Laser Texturing Technique for High Performance Magnetic Disk Drives", IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995, pp. 2946-2951.
Asahi Komag Co., Ltd.
Evans Jefferson
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